<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">
              {{this.currentCity}}
            </div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item of hotCities"
            :key="item.id"
            @click="handleCityClick(item.name)">
            <div class="button">
              {{item.name}}
            </div>
          </div>
        </div>
      </div>
      <div class="area"
           v-for="(items,key) of cities"
           :ref="key"
      >
        <div class="title border-topbottom">{{ key }}</div>
        <div class="item-list">
          <div class="item border-bottom"
               v-for="item of items"
               @click="handleCityClick(item.name)"
          >{{item.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import BScroll from 'better-scroll'
  import {mapState, mapMutations} from 'vuex'

  export default {
    name: "List",
    props: {
      hotCities: Array,
      cities: Object,
      letter: String
    },
    computed: {
      ...mapState({
        currentCity: 'city'
      })
    },
    methods: {
      handleCityClick(city) {
        //  直接调用store里的changeCity
        this.changeCity(city)
        //  跳转到首页
        this.$router.push('/')
      },
      //  扩展，把store里的changeCity传过来
      ...mapMutations(['changeCity'])
    },
    watch: {
      letter() {
        if (this.letter) {
          const element = this.$refs[this.letter][0]
          this.scroll.scrollToElement(element)
        }
      }
    },
    mounted() {
      this.scroll = new BScroll(this.$refs.wrapper)
    }
  }
</script>

<style lang="stylus" scoped>
  .border-topbottom
    &:before
      border-color: #ccc

    &:after
      border-color: #ccc

  .border-bottom
    &:before
      border-color: #ccc

  .list
    overflow: hidden
    position: absolute
    left: 0
    right: 0
    top: 1.58rem
    bottom: 0

    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem

    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem

      .button-wrapper
        float: left
        width: 33.33%

        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem

    .item-list
      .item
        padding-left: .2rem
        line-height: .66rem
</style>
